Process for preparing unsaturated carboxylic acids by gas phase

Details Process for preparing unsaturated carboxylic acids by gas phase Process for preparing unsaturated carboxylic acids by gas phase

1976-10-20

1978-09-12

Garner, Vivian

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

252443, 252455R, 252456, 252464, 252470, C07C 5132

Patent

active

041137698

ABSTRACT:
A process is disclosed for preparing acrylic acid or methacrylic acid comprising reacting in vapor phase acrolein or methacrolein (respectively) with molecular oxygen or an oxygen-containing gas, at a temperature between 200.degree. and 350.degree. C, in the presence of a solid catalyst, and with a contact time between 0.5 and 5 seconds, characterized in that the solid catalyst comprises molybdenum, vanadium, tungsten, cobalt, chromium and oxgyen chemically combined with these elements, the atomic ratios among the aforesaid elements being represented by the empirical formula: Mo.sub.12 V.sub.a W.sub.b Co.sub.c Cr.sub.d O.sub.e, wherein:

REFERENCES:
patent: 3775474 (1973-11-01), O'Hara et al.
patent: 3875220 (1975-04-01), White et al.
patent: 3997600 (1976-12-01), Ferlazzo et al.

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